# Anvil Review An offline AI assistant for iPhone that runs chat and image generation entirely on-device, no account required. ## Editor's Score: 66/100 Capability lands at 15 because Gemma 4 E2B, while genuinely impressive for an on-device model, is measurably weaker than the cloud models that ChatGPT and Claude run; the hardware gate (iPhone 15 Pro or newer only) further limits who can access those capabilities at all. Ease of use scores 19 because the no-account, no-login setup is genuinely frictionless and the feature set is clearly scoped, though the TestFlight distribution adds a small onboarding step most users are unfamiliar with. Value scores 22 because the current beta is entirely free with Anvil Pro included, which is hard to argue with, though the score is tempered by the unknown post-beta pricing. Delivery scores 10 because the app is a solo-developer beta with no published roadmap, no announced pricing, no confirmed social presence, and no substantial independent review corpus to verify claims; the promise is credible but the delivery track record is too thin to score higher. ## Pros - Fully offline after the initial Wi-Fi download, including chat, voice, image generation, and document analysis, with no account or login ever required. - Anvil Dream generates 1024x1024 images on the Neural Engine in Airplane Mode, a capability no cloud-dependent competitor in this directory can match offline. - Beta testers get Anvil Pro at no charge, meaning there are currently zero message limits, zero image caps, and zero cost to try the full feature set. ## Cons - Requires an iPhone 15 Pro or newer due to memory requirements; the app will not run on any older or non-Pro iPhone, cutting out a large portion of the iOS user base. - Gemma 4 E2B is a small model by necessity, and it produces noticeably weaker results than cloud models on multi-step reasoning, long-form writing, and coding tasks. - Built and maintained by a single independent developer with no published roadmap, no announced post-beta pricing, and no guarantee of continued updates if the project stalls. ## Pricing Free. - Beta (Anvil Pro included): Free Pricing reflects what we saw at the time of review (2026-10). Confirm current pricing on the official site. Category: AI Chatbots & Assistants (https://aitoolseekers.com/category/ai-chatbots-assistants) Official site: https://testflight.apple.com/join/5JGCZpxt Last verified by a human: 2026-10-18 Reviewed by a human at AI Tool Seekers, a hand-reviewed AI tools directory. Every listed tool is verified by a person before publishing. Scores are editorial opinions from a fixed rubric (capability, ease of use, value, delivery on promise) and cannot be bought; there is no pay-to-rank. Directory: https://aitoolseekers.com This review: https://aitoolseekers.com/tools/anvil Methodology: https://aitoolseekers.com/how-verification-works ## Verdict Anvil is the right pick for iPhone users who want a private, fully offline AI assistant and are willing to accept the real capability ceiling of a phone-sized model. Compared to ChatGPT or Claude, the on-device Gemma 4 E2B model is noticeably less capable on complex reasoning tasks, and the app requires an iPhone 15 Pro or newer to run at all. Anyone on an older device, or anyone who needs the reasoning depth of a cloud model, should skip it. Best for: Privacy-conscious iPhone users and frequent travelers who need AI offline. Not for: Anyone on an iPhone older than 15 Pro, or users who need cloud-level reasoning depth. ## Overview Anvil is a solo-developer iOS app that runs a full AI chat model and an image generation model directly on your iPhone, with no server in the loop. The chat engine is Gemma 4 E2B running through LiteRT LM, and the image side is an SDXL Lightning variant converted to Core ML that produces 1024x1024 images on the Neural Engine. The two models never load simultaneously; the app swaps between them based on what you are doing, which is the main engineering trick that makes both fit on a phone. The core promise is genuine: once you download Anvil Core over Wi-Fi, the app works in Airplane Mode with no account, no message caps, and no data leaving the device. Notes, tasks, photos, documents, and voice input all work offline. Web search and iCloud backup exist as optional add-ons, and they are the only parts that touch the internet. What makes Anvil distinct from the directory competition is not feature breadth but architecture. ChatGPT, Claude, and Gemini all route every message through cloud infrastructure; Anvil routes nothing. That is a real and meaningful difference for travelers, people in regulated industries, or anyone who simply does not want a third party reading their conversations. The tradeoff is equally real: Gemma 4 E2B is a small model by design, and it will not match GPT-4-class reasoning on hard tasks. The app is currently in public beta on TestFlight, built and maintained by a single developer named Nathan. That context matters for anyone evaluating long-term reliability. ## Who should use it Anvil fits a specific kind of user well: someone who travels frequently and cannot rely on a data connection, someone in a profession where sending queries to a cloud service raises compliance or confidentiality concerns, or a technically curious iPhone owner who wants to see what on-device inference actually feels like in daily use. The no-account requirement is a genuine convenience for people who are tired of creating yet another login. If you need strong reasoning on complex writing, coding, or analysis tasks, look at Claude or ChatGPT instead. Both are available on iOS, both have free tiers, and both run far larger models than any phone can currently hold. Claude in particular handles long documents and detailed reasoning at a level Anvil's on-device Gemma 4 E2B model cannot match. ## FAQ Q: What iPhone do I need to run Anvil? A: An iPhone 15 Pro or newer is required. The app will not run on older models or non-Pro iPhones due to memory constraints. Q: How much does Anvil cost? A: It is currently free in public beta on TestFlight, and every beta tester receives Anvil Pro access at no charge. Post-beta pricing has not been announced. Q: Does Anvil send my data to the cloud? A: No. Chat, voice, notes, tasks, photos, and document analysis all run on-device. Web search and iCloud backup are optional and off by default; those are the only features that touch the internet. Q: What AI model does Anvil use for chat? A: Gemma 4 E2B running through LiteRT LM. It is a small model sized to fit on a phone, which means it is less capable than cloud-hosted models on complex tasks. Q: Can Anvil generate images offline? A: Yes. Anvil Dream is an SDXL Lightning variant running in Core ML on the Neural Engine, producing 1024x1024 images entirely on-device, including in Airplane Mode. Q: Do I need to create an account? A: No account or login is required at any point. You install via TestFlight and the app works immediately.